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The first evidence that dark matter existed is traced back to the 1930s, but it became even more clear that some invisible mass was acting on the gravitational forces of the universe in the 1960s.

As the stars continue to merge and grow, the gravitational forces grow with them.

He's in a giant centrifuge, being whizzed around and around, to mimic the extreme gravitational forces of a rocket launch - and the even more extreme G-Forces of coming back down.

The Standard Model encompasses four forces: the strong nuclear force, the weak nuclear force, the electromagnetic force, and the gravitational force.

Limbs and neck wrestling relentlessly with immense gravitational force.